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Finding the Fourth Proportional to 1,405,681.12, 1,939,831.10 and 761,099.32

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Solution

The fourth proportional to 1,405,681.12, 1,939,831.10 and 761,099.32 is: 1,050,312.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,681.12 : 1,939,831.10 = 761,099.32 : x
  2. Step 2: Convert to fraction form
    1,405,681.12/1,939,831.10 = 761,099.32/x
  3. Step 3: Cross multiply
    1,405,681.12x = 1,939,831.10 × 761,099.32
  4. Step 4: Simplify right side
    1,405,681.12x = 1,476,404,131,124.85
  5. Step 5: Solve for x
    x = 1,476,404,131,124.85/1,405,681.12
  6. Step 6: Final answer
    x = 1,050,312.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.